Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/35ace089a8e5
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13956 from bebef1987/942107_1

Bug 942107 - Reduce volume and be smarter about our use of locators brow...

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https://hg.mozilla.org/integration/gaia-central/rev/175e5356788c
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 942107 - Reduce volume and be smarter about our use of locators browser_app